Well pump



Oct. 4, 1938. H. A. SCHMIDT WELL PUMP Filed Sept. 8A, 1936 3 Sheets-Sheet l E lil Oct. 4, 1938. H. A. SCHMIDT WELL PUMP Filed Sept. 8, 1936 5 Sheets-Sheet 2 da L; ww@ ,www

, w w i i LLA l Oct. 4, 19.38.l H. A. SCHMIDT WELL PUMP Filed Sept. 8, 1936 3 Sheets-Sheet 3 r www@ n W ZM@ 6 Y 5 m w Patented Oct. 4, 1938 UNlTEo STATES PATENT OFFICE? WELL PUMP v Herbert A. schmidt, Whittier', oeuf., assigner ef one-half to James Calif.

Application September 15 Claims.

This invention relates to pumping apparatus and relates more particularly to well pumps. A general object vof this invention is to provide a practical and very efficient double acting well pump. Y v

Another object of this invention is to provide a pump for use in oil wells, etc. that is operable to alternately dischargecharges of liquid and gas into the oil string. i

Another object of thisinvention is to provide a deep well pump that assures the eiiicient recovery ofthe liquid or oil from the well by discharging a charge of gas into the oilv string following each oil elevating stroke, which gas materially assists in raising the oil to the surface.

Another object of this invention is to provide a double acting pump of the character mentioned that is adapted to receive gas under pressure that may bepassed into the well from the surface of the ground and that discharges this gas under pressure into the oil string following each oil elevating stroke.

Another object of this invention is to provide an improved well pump that is double acting and that is operable to displace or elevatea charge of liquid during each movement of its plunger.

Another object of this invention is to provide an appliance or attachment for a well pump that renders `the pump double acting therebygreatly increasing its efliciency. l

Another object of this invention is to provide an appliance or attachment of the character mentioned that may be readily applied to a typ-` ical well pump with a minimum of alteration and `at little cost.

. Another object of thisinvention is to provide an attachment or appliance for a typical single acting deep `well pump `that makes the pump double acting and that provides for the alternate pumping oi liquid and gas.

The various objects and features of my inven- -tion will be fully understood fromV the following detailed description of typical preferred forms and applications of my invention, throughout which description reference is made to the accompanying drawings, in which:

Fig. l is a central longitudinal detailed Sec- `tional view of one form of the invention showing the parts in the operative `positions in the well. Fig. 2 is an enlarged fragmentary longitudnal detailed sectional view of the upper portion of the pump illustrated inFig. 1 showing the plunger at the lower end of Vits stroke. Fig. 3 is a View similar to Fig, 1 illustrating another form of the invention. Fig. 4 is an enlarged, lon- V. Keith, Los Angeles, Y

s, 1936, seal Ne. 99,750

gitudinal, fragmentary detailed sectional View of the upper portion of the pump illustrated in Fig. 3 showing the plunger latched at the lower end of its stroke. Fig. 5 is a View similar to Fig.

1 illustrating still another form of the invention. 5 Fig. 6 is an enlarged fragmentary longitudinal detailed sectional view of the upper portion of the pump illustrated in Fig. 6` showing the plung- Ver at the lower end of its stroke, and Fig. 'l is an enlarged fragmentary longitudinal sectional Vl0 view of a slightly modified form of anchor assembly.

The present invention is adapted to be embodied `in Various forms and may be provided in the form of attachments for use with typical well pumps. .In the following detailed disclosure I will described several typical forms and installations of the invention, it being understood that the invention is not to be construed as limited or restricted to the speciiic structures or applications about to be described, but that it is to be taken as including any featuresY orfmodiilcations that may fall within the scope of the claims.

The embodiment of the present invention illustrated in-Figs. 1 and2 of the drawings includes, 25 generally, 'a seat I0 Von the lower end of an oil rstring S, a pump barrel II; an anchor l2 connected with the barrelIi and cooperating with the seat I0 to suspend the barrel where it extends beyond the lower end of the string S,`a plunger v I3 operable in the barrel I to displace liquid upwardly into the string S during'its down stroke and means Iliwhereby the plunger I3 displaces gas into the string S during its up stroke.

The `seat I0 and the associated parts may be"35 in the form -of an attachment for application to the lower end of a typical oil string S. The string S is provided to conduct the fluid from the well and may be madeup of lengths of tubing in the usual manner; The seat IIJ is a tubular member 40 connected with the lower end of the oil string S by a suitable coupling I5. A downwardly and inwardly inclined wall I is provided on the interior of the seat I0. 4An annular downwardly facing shoulder I'I is provided on theinterior of the seatv45 I0 'below its inclinedwall I6. The shoulder I1 is preferably inclined downwardly and outwardlyr Vas illustrated. In accordancelwith `the invention a tubularl section I8 is connectedwith the lower S end of the'seat I0. `The section I8 may be thread- 50 ed on the lower `portion `of-the seat It] and may be of substantially the same diameter as the oil lstring S. A shoe or collar I9'is` provided on the lower end. ofthe section 4i8 and presents an upwardlyfacing `internal shoulder 20.

An annular or tubular packing assembly 2| is provided in the section I8 and is supported on the shoulder 20. The packing assembly 2| may comprise superimposed rings. Alternate rings of the assembly 2| have inwardly and outwardly convergent ends and the ends of the adjacent rings cooperate whereby the packing assembly tends to expand both inwardly and outwardly when subjected to compression. The lower end of the lowermost ring of the assembly 2| is inclined downwardly and inwardly and cooperates with the shoulder 2|] which may be correspondingly inclined, as illustrated. A metal ring or follower 22 is provided at the upper end of the packing assembly 2| and its upper end cooperates with a downwardly facing shoulder 23 on the interior of the section I8. The packing assembly 2| is adapted to be compressed by the collar I9 and is Y provided to seal between the section I8 and parts on the barrel, as will be hereinafter described.

The barrel II constitutes the outer relativelyI stationary element of the pump proper. The barrel I I is an elongate tubular structure extending downwardly from the packing assembly 2| to project into the uid of the well. A standing valve V is provided on the lower end of the barrel II. The standing valve V may include a tubular cage 24 having an internal seat 25 and a ball 26 in the cage 24 for seating downwardly on the seat 25. It will be observed that the lower end of the barrel I I carrying the valve V may be unsupported and need not be provided with an anchor or the like. A connecting member 21 is threaded in the upper end of the barrel I I to facilitate its connection with the anchor I2. The barrel II, its valve V and the plunger I3 may be typical well pump parts.

The anchor I2 is provided to suspend the barrel II and to hold the barrel against movement. The anchor I2 includes a tubular member 28 threaded on the upper end of the connecting member 21 to extend upwardly through the packing assembly 2|. The tubular member 28 extends upwardly into the lower end of the seat I0 and its upper portion may be increased in wall thickness. A connecting member 29 is threaded in the upper end of the tubular member 28. An anchor collar 30 is threaded on the upper portion of the connecting member 29 and has its lower end spaced some distance above the upper end of the tubular member 28. 'Ihe anchor collar 30 is provided with a downwardly and inwardly inclined surface 3| adapted to cooperate with the wall I6 of the seat IIJ-to suspend the barrel II from the seat. The cooperation of the surface 3| with the seat wall I6 also prevents fluid from the string S from passing downwardly into the tubular section I8.

A split lock ring 32 surrounds the connecting member 29 between the lower end of the anchor collar 30 and the upper end of the tubular member 28. The periphery of the lock ring 32 is tapered downwardly and inwardly. When the pump is lowered through the string S to its position in the well the tapered periphery of the lock ring 32 cooperates with the inclined wall I6 of the seat IIJ and this cooperation causes contraction of the ring. When the ring 32 moves past the shoulder I1 it snaps outwardly or returns to its original dimensions to cooperate with the shoulder I1. The cooperation of the lock ring 32 with the shoulder I1 serves to hold the barrel II and its associated parts against upward movement relative to the string S. When an upward strain is applied to the pump to remove it from the well the cooperation of the upper outer corner of the lock ring 32 with the inclined shoulder I'I results in contraction of the ring so that it passes upwardly through the seat II) allowing the pump to be withdrawn from the seat I0. In accordance with the invention the anchor I2 is provided with means for packing about the plunger I3. A tubular section 33 is threaded in the upper end of the anchor collar 3U and projects upwardly from the collar. A collar 34 is threaded on the upper end of the section 33 and carries a tubular member 35. A packing assembly 36 similar in nature to the packing assembly 2| is arranged within the tubular member 35. A gland or follower 31 is threaded in the upper end of the member 35 to compress the packing assembly 36. The upper end of the follower 31 may be open to the interior of the string S to allow the fluid pressure or uid head in the string to compress the packing assembly 36.

The plunger I3 is the reciprocable element of the pump and is operable by a typical pump rod R. The plunger I3 extends through the packing assembly 3B, and the various parts of the anchor I2 to extend into the barrel II. The plunger I3 carries the cup leathers or other suitable sealing elements 38 for slidably sealing with the interior of the barrel II. The sealing elements 38 are preferably such that they are eiective during both strokes of the plunger. Heads 39 may be provided on the plunger I3 at the opposite ends of the assembly of sealing elements 38. 'I'he reciprocating plunger I3 is tubular to conduct the liquid from the barrel I I to the string S during its down stroke. A working valve V' is provided on the plunger I3 to control the passage of iluid through the plunger. In the particular instance illustrated the valve V is provided at the upper end of the tubular plunger I3, it being understood that the valve V may be otherwise positioned on the plunger I3. 'Ihe valve V includes a ported cage 40 secured to the upper end of the plunger I3.and to the lower end of the rod R to form a connection between the plunger and red. The cage 40 houses a valve or ball 4I which cooperates with a seat in the cage to control communication between the interior of the string S and the interior of the barrel II. The

vabove described packing assembly 36 seals about the plunger I3 to prevent the leakage of fluid from the string S into the anchor I2.

The means I4 provides for the pumping of gas from the well into the string S during each up stroke of the plunger I3. It is a feature of the invention that the means I 4 renders the pump double acting so that it displaces or forces fluid into the string S during each movement of the plunger I4. The means I4 includes a multiplicity of ports 43 in the wall of the section I8. The ports 43 communicate with the interior ci the section I8 between the lower end of the seat I and the upper end of the follower 22. In installations where the level L of the liquid in the well is above the ports 43 the invention provides a tube 44 for carrying the gas from the well to the ports. The tube 44 may be threaded on the exterior of the collar I9 to have its lower end closed against the entrance of the liquid in the well. The tube 44 extends upwardly around the section I8, the seat I0 and the string S to a point above the level L of the iluid in the well. The gas conducting tube 44 surrounds the parts just mentioned with substantial clearance leaving an annular passage for conducting the gas downwardly to the ports 43. 'I'he tube 44 may be formed of one ormore. lengths of tubing. It is to lbe `understood that where the level L of the liquid in the well'isbelow the ports43 the tube 44`rnay be eliminated. i y The means I4 further includes inlet valve l means for controlling the admission of gas from vtol the upper end of .the pump barrel l-I.

Ythe seat 45 and fully close the ports 46.

tion I8 and, therefore, communicate with theV `ports 43. A shiftable gas inlet valve 41 of tubular formis arrangedpwithin the member28. to cooperate with the seat 45. Theupper end of the valve 41 is tapered to effectively. cooperate with The valve 41 surrounds the`plunger I3 .with substan- Atialclearance leaving an annular fluid passage.

A spring 48 is arranged under compression' betweenuthe upper end of the connecting member 21 and the lower endof the valve 41 to yieldingly hold the valve in sealing. cooperation with the seat 45y where -it closes the ports 46. The plunger I3 extends through the connectingrmembers 21 and 29, the tubular member 28 and the anchor -collar 30 with substantial clearance leaving an annular gas passage l?.V The lower .end of the `passage P is in direct communication with the upper end of the barrel` Il `and the valve 41 described above controls the communication be- .tween the passage P and the interiorV of the tubular section I8.

The means I4 further includes outlet valve means controlling communication between the upper end of the passage P and the lower end of the string S. An annular recess or groove 49 is provided in the interior of the anchor collar 30 toconstitute the upper end of the passage P. A plurality of spaced `vertical ports 5i! extend `downwardly through the collar 3l) from its upper end and communicate with the groove 49. A 'shiftable discharge valve 5I is provided t0 con- Y trol the ports 50.V The valve 5I may be a tubular member shiftably surrounding the tubular seotion 33. The lower end of the valve 5I is adapted to cooperate with the upper end of the collar to close the ports 5I). Gravity and the hydrostatic head in the string S serve to hold the valve 5I in its closed position and to return it to its .closed position after operation.` The lower end of the collar 34 limits the upward travel of the valve 5I.

When the oil string S is to be run into the well the seat II), the tubular section I8, the collar I9, the tube 44 and the associated parts are connecte ed with the lower end of the string.V Following the proper setting or positioning of the string S the well pump may be lowered through the string to its operative position. When the pump approaches its operative position the barrel II passes through the packing assembly 2|. When the lock ring 32 engages `the inclined seat surface `I6 it is` contracted and uponpassing the shoulder` I1 the lockA ring 32 expands or returns to its normal size. The anchor surface 3| seats on the wall I6 of the seat Ill to suspend the barrel VI I from the seat while the ring 32 cooperates with the shoulder I1 to preventupward movement ofthe innerv barrel and the connected parts. The pump is irl-condition for ,operation vwhen seated orlocated as `just described. q

During operation the string of. pllmllrods R is reciprocated in the usual manner to reciprocate the plunger I3. During the upstroke 'of the plunger I3 a reduced pressure is created in the lower end of the barrel -II resulting 'in opening of thevalve 26 `and passage ofliquid from the well intothe lower end of the barrel. As 'the plunger `I3 moves upwardly gas which may have been drawn intothe upper end of the barrel duringrthe previous down'strokeof the .plunger is yforced upwardly through the passage P under .charge of oil in the barrel II below the sealing elements 3S of the plunger I3 is displaced upwar'dly through the tubular plunger to open the valve 4I.v and discharge into the oil string S. As

the plunger I3 moves downwardly inthe barrel II a reduced or lessened pressure is created vin -the barrel above the elements 38 and the gas in the well is drawn or received inthe barrel above the'plunger. Thus .during the down strokeV of the plunger I3 a charge oi liquid is discharged into the lower end ofthe oil string S and a charge of ygas is received in the barrel II above the sealing elements 38. Thegas received in the pump may be rock gas or` gas produced from the earth formation or may be gas pumped into the well from the surface of the ground to facilitate the recovery of the oil `or liquid. The pump illustrated in 1Figs. l and 2 of the. drawings operates to discharge alternate charges of liquid and gas l into the oil string S under pressure.. The charges of gas forced into the oil string by the pump greatly assist in elevatingV or lifting the liquid to the surface of the ground in the well known manner. Being double` acting the well pump de- `scribed above is particularly efficient. It will be noted that the barrel II, the `plunger I3 and the valves V and V may be elements of a typical well pump while the other parts described above may constitute an attachment or appliance for making the pump double acting and gas handling.

' Figs.v 3 and Llof the drawings illustrate a form and application of thev invention embodying a typical anchor I2a and adapted to be anchored in the lower end of'a string of oil tubing T. The

pump illustrated in Figs. 3 and 4 of the drawings I includes, generally, a pump barrel IIa carrying the anchor I2a and adapted to be anchoredV in the lower end of the string of `oil tubing T, a

plunger I3a operable in the barrel IIa, packing., means carried by the `barrel Ila to seal with the string T, and means I4n whereby the pump is operable to handle gas admitted to the string T below the packing means 55.

The barrel IIa may be of typical construction,

.being an elongate tubular member or assembly.

on the lower end of the string T. The shoe 51 has a downwardly and inwardly inclined seat 5B on its interior and has an annular internal ilange 59 spaced below the seat 58.

Iii)

'Ihe anchor .I2El is provided on the lower end ofthe barrelI I@ to cooperate with the anchor shoe 51. In practice the anchor I2EL may be kconl nected Withthe lower end of the barrel .IIa by a tubular valve cage 60. The valve cage 60 may be thre'aded on the anchor I2a and may be connected with the vbarrel I Ia by a suitable connecting member 6I. 'I'he anchor I2a has a downwardly and inwardly tapered face 62 adapted to seat on and seal with the seat 58. The lower portion of the anchor I2@ is split into a multiplicity of flexible lingers 63 which carry lugs 64. The lugs 64 are adapted to spring into. cooperation with the under side of the flange 59 when the pump is lowered into place and their cooperation with the flange 59 releasably holds the pump against upward movement. The anchor shoe 51 and the anchor I2a just described may be of typical construction. A standing'valve is provided on the lower end of the barrel Ila. The standing valve may comprise a seat 65 in the lower portion Vof the cage 68 and a ball valve 66 for cooperating downwardly with the seat 65.V The connecting member 6I may have an internal perforate web 61 to limit the upward movement of the valve 66.

The plunger I (liL is the reciprocating element of the pump. 'I'he plunger I3a extends into the barrel IIa from its upper end and carries series of packing means or elements 68 for slidably sealing with the interior of the barrel I Ia. The sealing elements 68 are preferably operable to seal with the interior of the barrel I9a when the plunger I3a operates in both directions. The plunger I3a is tubular to pass or conduct fluid from the barrel IIa upwardly into the string T. A traveling valve is carried by the plunger |33. The traveling valve may be arranged at the upper end of the plunger I3a and may comprise a cage 69 forming a connection between the upper end of the plunger I3a and the plunger operating rod R. 'I'he cage 69 is perforate and houses a ball valve 1I). The valve 'I8 is adapted to seat downwardly in the cage 69 to close olf communication between the interior of the string T and the interior of the plunger I3a during the upward movement of the plunger.

The packing means 55 is provided to seal off the upper end of the passage 56 from the interior of the string T above the passage. The packing means 55 includes a tubular section 1I threaded on the upper end of the connecting member 51a to extend upwardly through the string of tubing. The upper portion of the section, 1I is thickened and an annular external flange 12 is provided on the member 1I between its ends. A packing assembly 13 surrounds the thickened portion of the section II above the flange 12. The packing assembly 13 may be similar to the above described packing assembly 2| comprising a multiplicity of superimposed rings having tapered abutting ends whereby the assembly is expansible outwardly as well as inwardly when subjected to compression. The packing assembly 13 is operable to seal with the interior of the string T and with the exterior of the tubular section 1I. A follower 14 is provided to cooperate with the upper end of the packing assembly 13. The follower 14 is an elongate tubular member and its lower end bears on the inclined upper end of the upper ring in the packing assembly 13. A tubular member 'I5 of reduced diameter is threaded in the upper end portion of the section II and a packing gland housing or body 16 is carried on the upper end of the member 15. A packing assembly 11 is arranged in the body I6 toseal about the plunger I3a. The packing assembly 11 may be similar to the assembly 55. A follower 18 is threaded in the upper end of the body16 to actuate or compress the assembly 11. A spring 19 is arranged mder compression between a shoulder 8U on the body 16 and a shoulder 8I on the follower 14 t0 urge the follower downwardly against the packing assembly 13. The spring 19 is provided to actuate or assist in actuating the packing assembly 13.

The invention provides means for connecting the barrel IIa and the parts connected therewith with the plunger I3EL and rod R to be run through the tubing string T on the rod R with the packing assembly 13 in a normal uncompressed state. tubular follower 14 projects upwardly beyond the upper end of the gland body 16 and has two diametrioally opposite bayonet slots 82. The bayonet slots 82 extend downwardly from the upper end of the tubular follower 14. VA pin 83 projects radially from opposite points on the cage 69 to cooperate-with the bayonet slots 82. When the follower 14 is connected with the rod R by the pin 83 cooperating with the bayonet slots 82 the barrel IIa, the tubular section 1I, the member 14, the gland body 16 and the associated parts are supported on the shoulder 8I through the medium of the spring 19. Thus the pressure exerted on the packing assembly 13 by the spring 'I9 is relieved from the packing assembly when the pump is run into the well. Following the anchoring of the pump in the shoe 51, as described above, the rod R may be given a partial rotation and a slight upward movement to disengage the pin 83 from the bayonet slots 82 whereupon the plunger I3EL may be reciprocated by the rod R.

The means I4a is provided to render the pump double acting and capable of handling gas as well as liquid. The means I4a includes means for admitting gas from the well or well casing into the passage 56. A multiplicity of spaced ports 84 is provided in the string of tubing T to communicate with the passage 56 below the flange 12. In certain installations the ports 84 may directly communicate with the portion of the well or the well casing carrying the gas. Where the level L of the liquidrin the well is vabove the ports 84, as illustrated in the drawings, a tube 85 may be threaded on a coupling 86a of the string T to extend upwardly around the string to a point above the liquid level L. The tubing 85 is spaced some distance from the string T to leave an annular passage placing the ports 84 in communication with the portion of the well containing the gas.

The means I4a further includes inlet valve means for governing the admission of gas to the upper end of the barrel IIa. This valve means may include a seat 86 on the interior of the tubular section 1I. Ports 81 extend through the wall of the tubular section 'II to have their outer ends in communication with the passage 56 and tohave their inner ends at the seat 86. A shiftable tubular valve 88 is arranged in the tubular section 1I and is adapted to seat upwardly against the seat 86 to close the ports 81. A spring 89 is arranged under compression between the lower end of the valve 88 and the upper end of the connecting member 5`Ia to urge the valve 88 to its closed position. The plunger I 3a extends through the tubular section 1I with substantial clearance leaving a fluid passage 90 which has communication with the interior of the barrel I Ia and which extends upwardly to an annular groove 9| in the upper portion of the section 1I. Valve means is provided to govern communication between the passage 98 and the interior of the string T above vthe packing means 55. This valve means may.

TheA

`section 7| to close the ports 92.

include a multiplicityof ports 92 extending up-4 wardly through the section 1| `from the groove 9| `to the upper end of the Section. A shif table tubu- `fdrawings may be anchoredl in its operative position Qin the well `by lowering it into the well on k l.the string of rods R. When the pump is lowered through thewell the pin 83 cooperates with the bayonet slots 8.2 whereby the rod R carries the tubular followerl4 `and through the medium of the spring'lS bearing onrthe shoulder 8| carries the other parts "of the pump. When the pump reaches its proper position'in the well the anchor I2a is automatically latched in theshoe 5`|,"as described above. Following theanchoring of the pump the rod R is turned and moved upwardly to release the pin 83 from thebayonet slots 82. The spring 19 then exerts its pressure upon the packing assembly 13 to actuate the same against the controlof the string T and the exterior ofthe section The pump is then in condition for operation. k l

`Duringfthedown stroke of the plunger |3a fluid lwithin 'the barrel ||a below the packing elements-68 is displaced upwardly through the plunger |311` to discharge past the valve 'l0 into the string T. As tlfieplun'ger"ItEL moves downwardly a reduced pressure is-created inlth'e upper portion of the barrel |'|a causing opening of `the valve `88 and the admission. of gas from the `well above the level L. Thus the down `stroke of the plunger 13a `results in the discharge of a charge of liquid' into the string Tand the reception of a charge of gas in the barrel Ila above the sealing elements .68 of the plunger. As 'the plunger movesupwardly the gas aboveits seal'- ing` elements 68 isforced upwardly through the passage 90 and ports 92 to lift the valve 93` and flow finto" the string TI. Upward movement of the plunger |3a creates a reduced pressure in thelowerportion of the barrel ||2ab so that the valve 66. is unseated and liquid is ldrawn into .the lower portion of the barrel. From the above it will be apparent that the pump illustrated in Figs. 3 and 4 ofthe drawings is a double acting pump operable to displace a charge of liquid parts andthe packing means 55 andthe meansv I4 vmay comprise an attachment to adapt the pump for the duty described above.'

yFigs.'5 and Grof the drawings illushate a form ofthe invention adapted to handle liquidv orv oil A during each stroke of its plunger." In thezpump illustrated in Figs. 5 and 6 'the barrel, Ile, the plunger |321, the packing means 55 and the valves 88 and 93 -may be identical with the correspond-V ing elements of theform' ofthe invention illustrated in Figs. 3 and'4`and corresponding reference numerals will be employed for such parts.-

`itsli-:ngtlr and the. collar 86 and tube4 8.5 are omit..

ted. The lowerend of thepassage 56, occurring between the `barrel ||a and the interior of the tubing stringT has communication with the interior of the -anchor |2 below the valve 66. A plurality of lateral ports 56 is provided in the anchor 12a to place the lower portion of the passagef56 inlcommunication with'the interior of the anchor. vThepo-rts 96 communicating with the interior of the anchor |28- below the valve 66 admit the Well fluidinto the passage 56.

The operation of the pump illustrated in Figs. 5 and 6 of the drawings is substantially the same as the operationofthe structure illustrated in Figs. 3fand 4, except that the pump handles liquid duringeach movement of its plunger'la. During the down stroke of the plunger I3a liquid is displaced from the lower portion of the barrel Ha through the `plunger todscharge into the tubing string'I.` During the down stroke of the plunger i3a liquid is drawn through the anchor |2a`,.the ports 96, the passage 56 and the ports 31 into the upper portion of the barrel la. During the up stroke of the barrel ||a the liquid in i the barrel above the sealing elements 68 is forced through the ports "92 and the tubular follower M into thetubingstring T and liquid is drawn into the'lowerportion of the barrel ||a through the anchor l2a andl past the valve 66.

Fig;A 7 of the drawings illustrates a slight modification off the plunger and anchor structure illustrated in Figs. 52and 6. In this form of the invention a member 98 is interposed between the upper end of the anchor l2a and the lower end of the valve cage 6|). The member 98 `may` be threaded 'on the upper` end of' the anchor l2a and may be threaded into the lower end of the cage 60. A central longitudinal opening 99`extendsfthrough the member' 98 toplace the interior of the anchor |2ab in 'communication'with the valve seat. |00 of the standing valve 66. VA pluralityl'of Vlateral Yports ||l|is provided in the wall of the member 98 andplaces the opening 99 in communication with thepassage 56. The ports ||l| Aare adapted to admit ,fluidi fromfthe well into the 'passage 56 yduringrthe down stroke of the plunger l`3a. The member 98 may be read ilylinterposed betweenthecagell and"v anchor I2a of a typical well pump so that the pump may embodya typical standing valve and a typical anchor. l'

Having described only typical preferred forms and applications of my invention, I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear to those skilled inthe art or fall within the scope of the following claims. y

' Having described my invention, I claim:

1.` Well pump-ing apparatus including, a tubing for conducting the iluid to the surface, a barrel in the tubing having an inlet valve vat its Y lower end, aV tubular plunger reciprocable in the barrel and having a discharge communicating with the tubing, a traveling valve on the plunger, means sealing off between the barrel and tubing below theA discharge of the plunger, there being i communicating ports inthe barrel `and tubing below said means, an inlet Valve controlling the port in thebarrel, and outlet valvemeans controlling communication between-the upper end of the barrel and the tubing above the sealing means.

2.. In a double actingwell pump for use in the 'well, a tubing for conducting the fluid to the surface, a barrel extending into the tubing and asY having an inlet valve for` its lower end, atubular plunger operable in the barreland having a discharge communicating with the tubing, a working valve controlling the discharge from the plunger into the tubing, the plunger discharging into the tubing during its down stroke, means connecting the barrel with the tubingand sealing between the barrel and tubing below the discharge of the plunger, there being a port in the wall of the upper portion of the barrel,v a tube on said means placing said port in communication with the well above its liquid level, a Valve controlling said port and open during the down stroke of the plunger, and a valve governing communication between the upper end of the barrel and the tubing open during the up stroke of the plunger.

3. An attachment for a well pump for use on a tubing and having a barrel with a standing valve and a reciprocable tubular plunger having a working valve and operable in th'e barrel, said attachment comprising a tubular part secured to the upper end of thel barrel and having a port in its wall, a tubular part secur'ed to the tubing and surrounding the rst tubular part to provide Vva space thereabout communicating withthe port, there being a port in the second tubular part communicating with said space to admit 'fluid from the well to said space, `a valve controlling the first mentioned port, and valve means governing communication between the upper portion of the barrel and the interior ofthe tubing.

4. In combination with a well pump including a tubing, a barrel with an inlet valve at itslower end and a tubular plunger operable inthe barrel and having a discharge valve, an attachment for the pump comprising, a' tubular' member connected with the upper end ofthe pump barrel, a tubular'extension on the lower end of thetubing, packing means sealing between the-member and the interior of the tubing extension, there being ports in the member and tubing extension for placing the interior of the member and the upper end of the barrel in communication with 'the well, an inlet valve governing the admission of uid to the barrel through said ports, andan outlet valve governing communication 'between the interior of the member and the tubing above the packing.

5. An attachment for a well pump for-use on a tubing, said pump having a barrel with an inlet valve at its lower "end and a tubular plunger operable in the barrel and having a discharge valve, the attachment comprising, a tubular member connected with the upper end of the barrel, pack-- ing means sealing between the member and the interior of the tubing, means for actuating the packing following the anchoring of the pump, there being ports in the member and tubing for placing the interior of the member and the upper end of the barrel in communicationl with the well, an inlet valve governing the admission'of fluid to the barrel through said portsand an outlet valve governing communication between the interior of the member and the tubing above the packing means. K

6. vAn attachment for a well pump for use on a tubing, said pump having a barrel with an inlet valve at its lower end and a tubular plunger operable in the barrel and having a discharge valve, the attachment comprising,` a tubular member connected with the upper end ofthe barrel and forming a fluid passage between the upper end of the barrel and the'tubing, an outlet valve governing the Vpassage of uid through the member, means sealingbetween the exterior of the memkberrand the interior of the tubing, there being ports in the member and the tubing below the sealing means, and an inlet valve governing the admission of fluid from the well through the port in the member to the barrel.

7. An attachment for a well pump for use on a tubing, said pump having a barrel with an'inlet valve at its lower endV and a tubular plunger operable in the barrel and having a discharge valve, the attachment comprising, a tubular member connected with the upper end of the barrel .and forming a uid passage between the upper end of the barrel and the tubing, an outlet valve governing the passage of fluid through the member, means sealing between the exterior of the member and the interior of the tubing, there'being ports in the member and the tubing below the sealing means, means placing the port in the tubing in communication with the well above the liquid level therein, and an inlet valve governing ,the admission of fluid from the well through the port in the member to the barrel.

8. An attachment for a well pump for use on a tubing, said pump having a barrel with an inlet valve at its lower end and a tubular plunger operable in the barrel and having a discharge Valve, the attachment comprising, a tubular member connected with the upper end of the barrel and forming a fluid passage between the upper end of the barrel and the tubing, means on the member sealing about the plunger, an outlet valve governing the passage of fluid through the member, means sealing between the exterior of the member and the interior of the tubing, there being ports in the member and the tubing below the sealing means, and an outlet valve governing the admission of fluid from the well through the portfin the member to the barrel.

9. A well pump for use on a string of tubing including, a seat connected in the tubing, there being a port in the wallY of the tubing below the seat, a barrel extending from the lower end of the tubing, an anchor cooperating with the'seat, a tubular member interposed between the 'barrel and the anchor whereby the anchor suspends the barrel, a plunger operable in the barrel, said member having a port in its wall, an inlet valve in the member controlling its port, and an outlet valve controlling the passage of fluid through the member from the' barrel into the tubing.

10. A well pump for use on a string of tubing including, a seat connected in the tubing, there being a port in the wall of the tubing below the seat, means for maintaining said port in communicationA with the well above a liquid level in the well above said port, a barrel extending from the lower end of the tubing, an anchor cooperating with the seat, a tubular member interposed between the barrel 'and the anchor whereby the anchor suspends the barrel, a plunger operable inthe barrel, said member having a port in its wall, an inlet valve in the member controlling its port, and an outlet valve controlling the passage of fluid through the member from the barrel into the tubing.

11. A double acting well pump for use on a string of tubing including, a seat connected in the tubing, there being a portl inv the wall of the tubing below the seat, a barrel extending from the lower end of the tubing, an anchor cooperating with the seat, a tubular member interposed between the barrel and the anchor whereby the anchor suspends the barrel, means packing between said member and the tubing, means well above a liquid level therein higher than said port tosupply gas to said port, a plunger operable in the barrel, said member having a port in its Wall, an inlet valve in the member controlling its port, and an outlet valve controlling the passage of fluid through the member from the barrel into the tubing.

12. A well pump for use with a tubing having 4a shoe and a port above the shoe, said pump 'includng, a barrel in the tubing, an anchor on the barrel cooperatingA with the shoe to support the barrel on the tubing in spaced relation to its wall, a plunger operable in the barrel, a tubular member on the upper end of the barrel having a port in communication with the first mentioned port, means sealing Said ports, an inlet valve governing the passage of fluid through said ports to the barrel, and an outlet port controlling the flow of fluid through said member from the barrel.

13. Well pumping equipment comprising a tubing for conducting the pumped fluid Vto the surface, a shoe on the tubing, the tubing having a port above the shoe, a barrel in the tubing,r an anchor on the barrel cooperating with the shoe to support the barrel on the tubing in spaced relation to its wall, a plunger operable in the barrel, a tubular member on the upper end of the barrel having a port in communication with the first mentioned port, means sealing between the tubing and the member above said ports, means maintaining said ports in communication with the well above a liquid level higher than the port in the tubing to deliver gas to said ports, an inlet valve governing the passage of fluid through said ports to the barrel, and an outlet port controlling the flow of fluid through said member from the barrel.

14. Well pumping equipment comprising a tub-v ing having a shoe, a barrel extending through the tubing with clearance, an anchor assembly on the barrel cooperating with the shoe to support the barrel, said assembly being ported to maintain the space between the barrel and tubing in communication with the well, a tubular plunger operable in the barrel, means sealing off the upper end of said space from the tubing above the barrel, means for compressing the sealing means, means maintaining the last mentioned means inoperative during movement of the pump through the well, the upper portion of the barrel being ported to communicate with the said space, valve means governing the admission of uid to the upper portion of the barrel from said space, and valve means governing the passage of fluid from the upper end of the barrel to the tubing.

15. A double acting well pump comprising a tubing for conducting the pumped fluid, a barrel having an inlet valve for its lower end, means at the upper end of the barrel for locking the barrel to the tubing and releasable to allow upward Withdrawal of the barrel from thewell, a tubular plunger operable in the barrel and having a discharge communicating with the tubing, a working valve controlling the discharge from the plunger into the tubing, said means having ports for admitting fluid from the well to the upper portion of the barrel, inlet valve means controlling said ports, and discharge valve means governing communication between the tubing and the upper end of the barrel.

HERBERT A. SCHMIDT. 

